SpringMVC轻松学习-注解的使用(三)
时间:2014-04-30 13:49:15
收藏:0
阅读:625
根据上一讲的例子,我们下面就注解的使用进行详细说明。
我们采用sprng MVC开发项目时,通常都会采用注解的方式,这样可以大大提高我们的开发效率。实现零配置。下面我们从零开始重新做一个spring MVC的配置。这个项目完全采用注解的方式开发。同时,我们以后的spring MVC项目也都会采用注解的方式。
修改web.xml,文件内容如下:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24 |
<? xml
version = "1.0"
encoding = "UTF-8" ?> < web-app
version = "2.5" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee < servlet > < servlet-name >springmvc</ servlet-name > < servlet-class > org.springframework.web.servlet.DispatcherServlet </ servlet-class > < init-param > < param-name >contextConfigLocation</ param-name > < param-value >/WEB-INF/hib-config.xml,/WEB-INF/springmvc-servlet.xml</ param-value > </ init-param > < load-on-startup >1</ load-on-startup > </ servlet > < servlet-mapping > < servlet-name >springmvc</ servlet-name > < url-pattern >*.do</ url-pattern > </ servlet-mapping > </ web-app > |
springmvc-servlet.xml配置内容如下:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21 |
<? xml
version = "1.0"
encoding = "UTF-8" ?> < beans xsi:schemaLocation="http://www.springframework.org/schema/beans <!-- 对web包中的所有类进行扫描,以完成Bean创建和自动依赖注入的功能 --> < context:component-scan
base-package = "com.sxt" /> <!-- 启动Spring MVC的注解功能,完成请求和注解POJO的映射 --> < bean
class = "org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" /> <!--对模型视图名称的解析,即在模型视图名称添加前后缀 --> < bean
class = "org.springframework.web.servlet.view.InternalResourceViewResolver" p:suffix = ".jsp" /> </ beans > |
hib-config.xml(配置了spring集成hibernate)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80 |
<? xml
version = "1.0"
encoding = "UTF-8" ?> xsi:schemaLocation=" "> < context:component-scan
base-package = "com.sxt" /> <!-- 支持aop注解 --> < aop:aspectj-autoproxy
/> < bean
id = "dataSource" class = "org.apache.commons.dbcp.BasicDataSource" > < property
name = "driverClassName" value = "com.mysql.jdbc.Driver" > </ property > < property
name = "username"
value = "root" ></ property > < property
name = "password"
value = "123456" ></ property > </ bean > < bean
id = "sessionFactory" class = "org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean" > < property
name = "dataSource" > < ref
bean = "dataSource"
/> </ property > < property
name = "hibernateProperties" > < props > <!-- key的名字前面都要加hibernate. --> < prop
key = "hibernate.dialect" > org.hibernate.dialect.MySQLDialect </ prop > < prop
key = "hibernate.show_sql" >true</ prop > < prop
key = "hibernate.hbm2ddl.auto" >update</ prop > </ props > </ property > < property
name = "packagesToScan" > < value >com.sxt.po</ value > </ property > </ bean > < bean
id = "hibernateTemplate"
class = "org.springframework.orm.hibernate3.HibernateTemplate"
> < property
name = "sessionFactory"
ref = "sessionFactory" ></ property > </ bean > <!--配置一个JdbcTemplate实例--> < bean
id = "jdbcTemplate"
class = "org.springframework.jdbc.core.JdbcTemplate" > < property
name = "dataSource"
ref = "dataSource" /> </ bean > <!-- 配置事务管理 --> < bean
id = "txManager"
class = "org.springframework.orm.hibernate3.HibernateTransactionManager"
> < property
name = "sessionFactory"
ref = "sessionFactory" ></ property > </ bean > < tx:annotation-driven
transaction-manager = "txManager"
/> < aop:config > < aop:pointcut
expression = "execution(public * com.sxt.service.impl.*.*(..))"
id = "businessService" /> < aop:advisor
advice-ref = "txAdvice"
pointcut-ref = "businessService"
/> </ aop:config > < tx:advice
id = "txAdvice"
transaction-manager = "txManager"
> < tx:attributes > < tx:method
name = "find*"
read-only = "true"
propagation = "NOT_SUPPORTED"
/> <!-- get开头的方法不需要在事务中运行 。 有些情况是没有必要使用事务的,比如获取数据。开启事务本身对性能是有一定的影响的--> < tx:method
name = "*" /> <!-- 其他方法在实务中运行 --> </ tx:attributes > </ tx:advice > </ beans > |
reg.jsp如下
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30 |
<%@ page language= "java"
import = "java.util.*"
pageEncoding= "gbk" %> <% String
path = request.getContextPath(); String
basePath = request.getScheme()+ "://" +request.getServerName()+ ":" +request.getServerPort()+path+ "/" ; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" > <html> <head> <base href= "<%=basePath%>" > <title>My JSP ‘index.jsp‘
starting page</title> <meta http-equiv= "pragma"
content= "no-cache" > <meta http-equiv= "cache-control"
content= "no-cache" > <meta http-equiv= "expires"
content= "0" > <meta http-equiv= "keywords"
content= "keyword1,keyword2,keyword3" > <meta http-equiv= "description"
content= "This is my page" > <!-- <link rel= "stylesheet"
type= "text/css"
href= "styles.css" > --> </head> <body> <form action= "user.do" > 用户名:<input type=text name=uname /><br/> <input type=hidden name=method value=reg /> <input type=submit value=注册 /> </form> </body> </html> |
index.jsp 如下:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28 |
<%@ page language= "java"
import = "java.util.*"
pageEncoding= "gbk" %> <% String path = request.getContextPath(); String basePath = request.getScheme()+ "://" +request.getServerName()+ ":" +request.getServerPort()+path+ "/" ; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" > <html> <head> <base href= "<%=basePath%>" > <title>My JSP ‘index.jsp‘
starting page</title> <meta http-equiv= "pragma"
content= "no-cache" > <meta http-equiv= "cache-control"
content= "no-cache" > <meta http-equiv= "expires"
content= "0" > <meta http-equiv= "keywords"
content= "keyword1,keyword2,keyword3" > <meta http-equiv= "description"
content= "This is my page" > <!-- <link rel= "stylesheet"
type= "text/css"
href= "styles.css" > --> </head> <body> <h1>**********${params.uname}</h1> <h1>**********${requestScope.u}</h1> <h1>**********${requestScope.user}</h1> </body> </html> |
User.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37 |
package
com.sxt.po; import
javax.persistence.Entity; import
javax.persistence.GeneratedValue; import
javax.persistence.GenerationType; import
javax.persistence.Id; @Entity public
class User { @Id @GeneratedValue (strategy=GenerationType.AUTO) private
int
id; private
String uname; private
String pwd; public
String getPwd() { return
pwd; } public
void setPwd(String pwd) { this .pwd = pwd; } public
int getId() { return
id; } public
void setId( int
id) { this .id = id; } public
String getUname() { return
uname; } public
void setUname(String uname) { this .uname = uname; } } |
UserDao.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28 |
package
com.sxt.dao; import
javax.annotation.Resource; import
org.springframework.orm.hibernate3.HibernateTemplate; import
org.springframework.stereotype.Repository; import
com.sxt.po.User; @Repository ( "userDao" ) public
class UserDao { @Resource private
HibernateTemplate hibernateTemplate; public
void add(User u){ System.out.println( "UserDao.add()" ); hibernateTemplate.save(u); } public
HibernateTemplate getHibernateTemplate() { return
hibernateTemplate; } public
void setHibernateTemplate(HibernateTemplate hibernateTemplate) { this .hibernateTemplate = hibernateTemplate; } } |
UserService.Java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30 |
package
com.sxt.service; import
javax.annotation.Resource; import
org.springframework.stereotype.Service; import
com.sxt.dao.UserDao; import
com.sxt.po.User; @Service ( "userService" ) public
class UserService { @Resource private
UserDao userDao; public
void add(String uname){ System.out.println( "UserService.add()" ); User u = new
User(); u.setUname(uname); userDao.add(u); } public
UserDao getUserDao() { return
userDao; } public
void setUserDao(UserDao userDao) { this .userDao = userDao; } } |
UserController.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38 |
package
com.sxt.web; import
javax.annotation.Resource; import
org.springframework.stereotype.Controller; import
org.springframework.ui.ModelMap; import
org.springframework.web.bind.annotation.RequestMapping; import
org.springframework.web.bind.annotation.RequestParam; import
org.springframework.web.bind.annotation.SessionAttributes; import
com.sxt.po.User; import
com.sxt.service.UserService; @Controller ( "userController" )//这里的 @RequestMapping ( "/user.do" ) public
class UserController { @Resource private
UserService userService; @RequestMapping (params= "method=reg" ) public
String reg(String uname) { System.out.println( "HelloController.handleRequest()" ); userService.add(uname); return
"index" ; } public
UserService getUserService() { return
userService; } public
void setUserService(UserService userService) { this .userService = userService; } } |
说明:
- @Controller("userController")这里也可以使用component进行注解,这里的controller和component一样,但是一般不用component,而这样的注解还@Repository、@Service、@Controller大家估计都知道怎么使用了,不会的话看我的之前发的blog:http://www.cnblogs.com/wang3680/p/0f4eea023d8eb01b097c732fddba5725.html
- @RequestMapping("/user.do")
注解说明:这个注解是页面提交到user.dao中进行操作的controller,之前我们的controller还需要进行实现controller接口,而现在不需要实现此接口了,而且controller里面的函数也不需要去复写handleRequest方法了,这里我们就可以自己写自己的方法了,但是我们怎么知道页面提交给那个方法了呢?
- @RequestMapping(params="method=reg")说明:这个注解就是去解释页面提交的给了那个方法的,就是提交来的带有method=reg的就会调转到此方法中,我们上面的页面中是这样定义传值的<input type=hidden name=method value=reg />
- 问题又来啦,struts2中我们是根据属性的set和get方法得到我们传递来的值得,这里怎么办呢?我们在controller方法中添加参数将传递的值传递来,public String reg(String uname)
这里的命名必须和页面传来的对应上。
上面的controller中,我们传递的是uname,我们这样呢,将参数改成User user为public
String reg(User user)
1
2
3
4
5
6 |
@RequestMapping(params= "method=reg2" ) public
String reg(User user) { System.out.println( "HelloController.handleRequest()" ); userService.add(user.getUname()); return
"index" ; } |
说明:
这里呢其实是将User模型中的属性拿来用了,我们必须保证页面定义的名称和模型中的一样才行,这一点类此与struts2里面的模型驱动
评论(0)